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freyr/message-broker
====================

Standalone messaging library: transactional outbox, deduplication, per-transport producers and consumers (AMQP, Kafka) with retries, DLQ and replay

v0.4.0(5mo ago)2771[1 issues](https://github.com/freyr/message-broker/issues)MITPHPPHP >=8.2CI failing

Since Oct 11Pushed 1mo ago1 watchersCompare

[ Source](https://github.com/freyr/message-broker)[ Packagist](https://packagist.org/packages/freyr/message-broker)[ RSS](/packages/freyr-message-broker/feed)WikiDiscussions main Synced 3w ago

READMEChangelog (1)Dependencies (23)Versions (16)Used By (0)

Freyr Message Broker
====================

[](#freyr-message-broker)

Standalone PHP messaging library: transactional outbox with total per-lane ordering, consumer-side deduplication and dead-lettering with replay, and per-transport producers and consumers — AMQP and Kafka. Plain PDO storage (MySQL, PostgreSQL), no framework coupling.

What it is
----------

[](#what-it-is)

True **exactly-once** processing is rare and genuinely hard to build in PHP — it normally means hand-rolling a transactional outbox, consumer-side deduplication, and dead-lettering for every project. Freyr Message Broker packages that machinery as a reusable library: produce inside your database transaction, and the message reaches its transport with **at-least-once delivery + consumer-side deduplication** — exactly-once *processing* — with poison messages dead-lettered and replayable.

It is **multi-transport by design** so you adopt it within your existing infrastructure instead of standing up a new broker. Each transport is met on its own terms:

- **AMQP (RabbitMQ)** — competing-consumer queues, routed by message name. Best-effort per-key ordering (consistent-hash + single active consumer) is a **postponed** lane mode — not yet built; AMQP does **not** offer strict FIFO.
- **Kafka** — the partitioned log via `ext-rdkafka` or Debezium CDC (planned). This is the transport for **strict** per-key FIFO.

Strict per-key FIFO is **a Kafka capability**, not the point of the library — one of the things its exactly-once core makes possible on the partitioned log. AMQP's per-key ordering, when built, will be best-effort only; strict ordering that survives failures is routed to Kafka.

> **Status: early development.** Ground-up rewrite in progress (formerly a Symfony Messenger bundle, available as `v0.x` tags). No stable release yet; every API may change without notice.

Install
-------

[](#install)

```
composer require freyr/message-broker
```

Requires PHP ≥ 8.4, `ext-pdo`, and MySQL 8+ or PostgreSQL 13+. Install the pieces you use:

NeedAddAMQP transport`composer require php-amqplib/php-amqplib`Kafka transport`ext-rdkafka` (PECL)Avro wire format`composer require apache/avro`Redis schema cache`ext-redis`Graceful shutdown`ext-pcntl` (relay/consumer SIGTERM handling)Quickstart
----------

[](#quickstart)

Define a message, produce it inside your own database transaction, run the schema setup, relay it over AMQP or Kafka, and consume it with deduplication and retry — five steps, one lane, end to end. See [docs/QUICKSTART.md](docs/QUICKSTART.md) for a runnable produce → relay → consume example.

The lane concept
----------------

[](#the-lane-concept)

One outbox table holds every produced message; each row is tagged with a lane, a named drain of that table. Exactly one relay process serves one lane on one transport, which guarantees total in-order publishing per lane. For order-insensitive workloads, AMQP also ships an opt-in competing relay that trades that ordering guarantee for parallel throughput — see [docs/TRANSPORTS.md](docs/TRANSPORTS.md).

Documentation
-------------

[](#documentation)

- [Quickstart](docs/QUICKSTART.md) — produce → relay → consume, end to end
- [Transports](docs/TRANSPORTS.md) — AMQP and Kafka relay/consumer setup, lane modes
- [Schema and Avro](docs/SCHEMA_AVRO.md) — wire formats, schema registration, compatibility
- [CLI Reference](docs/CLI_REFERENCE.md) — every shipped console command
- [DLQ Operations](docs/DLQ_OPERATIONS.md) — inspecting, replaying, and purging dead letters
- [Production](docs/PRODUCTION.md) — observability, graceful shutdown, operational guidance

License
-------

[](#license)

MIT

###  Health Score

37

—

LowBetter than 81% of packages

Maintenance74

Regular maintenance activity

Popularity13

Limited adoption so far

Community8

Small or concentrated contributor base

Maturity46

Maturing project, gaining track record

 Bus Factor1

Top contributor holds 100% of commits — single point of failure

How is this calculated?**Maintenance (25%)** — Last commit recency, latest release date, and issue-to-star ratio. Uses a 2-year decay window.

**Popularity (30%)** — Total and monthly downloads, GitHub stars, and forks. Logarithmic scaling prevents top-heavy scores.

**Community (15%)** — Contributors, dependents, forks, watchers, and maintainers. Measures real ecosystem engagement.

**Maturity (30%)** — Project age, version count, PHP version support, and release stability.

###  Release Activity

Cadence

Every ~29 days

Recently: every ~36 days

Total

6

Last Release

153d ago

PHP version history (2 changes)v0.2.0PHP >=8.4

v0.3.0PHP >=8.2

### Community

Maintainers

![](https://www.gravatar.com/avatar/089ad642f79ded10ae84d86db9f2a71b74c88e02fdd3b57af9643951d41420d4?d=identicon)[Freyr](/maintainers/Freyr)

---

Top Contributors

[![freyr](https://avatars.githubusercontent.com/u/800286?v=4)](https://github.com/freyr "freyr (92 commits)")

---

Tags

symfonyevent-drivenulidMessengeroutbox-patterndeduplicationinbox-pattern

###  Code Quality

TestsPHPUnit

Static AnalysisPHPStan

Code StyleECS

Type Coverage Yes

### Embed Badge

![Health badge](/badges/freyr-message-broker/health.svg)

```
[![Health](https://phpackages.com/badges/freyr-message-broker/health.svg)](https://phpackages.com/packages/freyr-message-broker)
```

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